Information processing apparatus, information processing method, and storage medium

ABSTRACT

An information processing apparatus that provides information about a virtual viewpoint image includes: a generation unit configured to generate scene information including type information and time information, the type information indicating a type of an event occurring in an image-capturing region in which an image is captured by a plurality of cameras, the time information indicating a time when the event has occurred; and a provision unit configured to provide an output destination of material data with the scene information generated by the generation unit, the material data being generated from a plurality of captured images obtained by the plurality of cameras capturing images of the image-capturing region from different directions, the material data being used to generate the virtual viewpoint image depending on a position and an orientation of a virtual viewpoint.

BACKGROUND

Field of the Disclosure

The present disclosure relates to an information processing apparatus,an information processing method, and a program, and more particularly,to an information processing apparatus, an information processingmethod, and a program which are suitably used to generate a video imagefrom a virtual viewpoint.

Description of the Related Art

There is a technique for synchronously capturing images of an objectfrom a plurality of viewpoints by a plurality of cameras arranged atdifferent positions, and generating a virtual viewpoint content (animage viewed from any virtual viewpoint) by using the images from theplurality of viewpoints obtained by image capturing. Japanese PatentLaid-Open No. 2015-204512 discusses a technique for generating andstoring a virtual viewpoint content based on images obtained from aplurality of viewpoints, and reading out video image information databased on viewpoint information and visual field information, therebyacquiring any virtual viewpoint content.

However, the virtual viewpoint content has two degrees of freedom, i.e.,a time when the virtual viewpoint content is obtained, and a virtualviewpoint position and orientation (a position and orientation of avirtual viewpoint). Accordingly, in the case of generating the virtualviewpoint content for a certain scene, it is difficult to appropriatelydetermine both the time and the virtual viewpoint position andorientation. As a result, for example, a situation where no object isdisplayed as a result of searching for a scene may occur. Thus, in therelated art, for example, it is difficult to determine the position andorientation of a virtual viewpoint and to identify a scene. Therefore,it is difficult to enhance the user's convenience when the virtualviewpoint content is generated.

SUMMARY

According to an aspect of the present disclosure, an informationprocessing apparatus that provides information about a virtual viewpointimage includes: a generation unit configured to generate sceneinformation including type information and time information, the typeinformation indicating a type of an event occurring in animage-capturing region in which an image is captured by a plurality ofcameras, the time information indicating a time when the event hasoccurred; and a provision unit configured to provide an outputdestination of material data with the scene information generated by thegeneration unit, the material data being generated from a plurality ofcaptured images obtained by the plurality of cameras capturing images ofthe image-capturing region from different directions, the material databeing used to generate the virtual viewpoint image depending on aposition and an orientation of a virtual viewpoint.

Further features of the present disclosure will become apparent from thefollowing description of exemplary embodiments (with reference to theattached drawings).

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram illustrating a configuration of an informationprocessing system.

FIG. 2 is a flowchart illustrating processing to be performed whenmaterial data is generated.

FIG. 3 is a flowchart illustrating processing to be performed whenvirtual viewpoint auxiliary information is generated.

FIG. 4 is a flowchart illustrating processing to be performed when avideo image from a virtual viewpoint is generated.

FIG. 5 is a diagram illustrating an arrangement of a plurality of imagecapturing units.

FIG. 6 is a diagram illustrating a scene identifying information.

FIG. 7 is a diagram illustrating a virtual viewpoint video imageoperation screen.

FIG. 8 is a diagram illustrating a modified example of a time indicationunit.

FIG. 9 is a diagram illustrating a modified example of a display unit.

DESCRIPTION OF THE EMBODIMENTS

Exemplary embodiments will be described below with reference to thedrawings. The present exemplary embodiment illustrates an example of asystem in which a three-dimensional model about one or more objects isgenerated from a plurality of images captured by a plurality of imagecapturing apparatuses (cameras) and a virtual viewpoint content (freeviewpoint content) is generated based on the three-dimensional model.For example, in the case of soccer, the objects include a player, areferee, a ball, and a goal.

The virtual viewpoint content can be generated by combiningthree-dimensional models of one or more objects. A method for generatingthree-dimensional models of objects captured by the plurality of camerascan be implemented by, for example, a volume intersection methodindicated in “Virtual View generation for 3D Digital Video” (IEEEMULTIMEDIA Vol. 4 No. 1 pp. 18-26, 1997). In the volume intersectionmethod, a space of a measurement object imaged by a plurality of camerasis divided by a small cube or rectangular parallelepiped (hereinafterreferred to as “voxel”). Each voxel is geometrically converted and isprojected on images captured by the cameras. It is determined whetherthe voxel is projected within a silhouette of an object to be modeled inthe images. Further, the voxels that are determined to be projectedwithin the silhouette in the images captured by all the cameras areregistered as voxels that constitutes the object to be modeled. Thus, aset of voxels registered as described above is output as athree-dimensional model.

In order to generate the three-dimensional model from the imagescaptured by the plurality of cameras as described above, a large numberof calculations and a long calculation time are generally required. Inparticular, in the case of generating a three-dimensional model with ahigh resolution, there is a need to reduce the size of each voxel. Asthe size of each voxel is reduced, the number of voxels increases. As aresult, the number of times of determination as to whether thegeometrically converted voxels are projected within the silhouetteincreases. Accordingly, a system is configured using a material datageneration apparatus (image processing server, etc.) that preliminarilygenerates and stores texture data and the like holding athree-dimensional model and color information about each voxel of thethree-dimensional model as material data. According to this system, itis possible to prevent execution of processing of generating athree-dimensional model every time a virtual viewpoint content isgenerated, and to enhance the efficiency of processing.

In such a system, for example, in a case where a video image generationapparatus that generates a virtual viewpoint content using material datagenerates a virtual viewpoint content, the material data that ispreliminarily generated and stored can be acquired from the materialdata generation apparatus and a video image can be generated. A time atwhich the video image is to be generated from the virtual viewpointcontent may be designated, and then the position, orientation, viewingangle, and the like of the virtual viewpoint for outputting the videoimage may be set, and the video image may be generated based on thesetting.

However, when the data of these virtual viewpoint contents is accessedto generate a video image from a virtual viewpoint in a desired scene,there is a need. to identify the desired scene by scanning the time inthe long recorded time. Accordingly, the convenience for the user may beinsufficient. For example, in the case of a stadium game, such assoccer, it may be difficult to recognize the entire game from thevirtual viewpoint of a specific location. In this case, there is a needto scan the time and the position and orientation of the virtualviewpoint, which may lead to a deterioration in the user's convenience.

After the scene is actually identified, for example, the position andorientation of the virtual viewpoint may be moved. It may be desirableto vary, for each virtual viewpoint content, the moving speed, movementrange, or the like of, for example, the position and orientation of thevirtual viewpoint. For example, the desirable moving speed of thevirtual viewpoint content obtained from an image obtained by capturingan image of a ground game is higher than that of the virtual viewpointcontent obtained from an image obtained by capturing an image ofindoors. In other words, it is desirable that the moving speed withrespect to the virtual viewpoint content obtained from the imageobtained by capturing an image of indoors be set to about a walkingspeed, and that the moving speed with respect to the virtual viewpointcontent obtained from the image obtained by capturing an image of aground game be set to a player's running speed, or a ball speed. Makinga setting for designation and/or operation of the virtual viewpoint,which can be determined to some extent depending on the virtualviewpoint content, by the user every time processing is performed maylead to a deterioration in the user's convenience.

Accordingly, in the present exemplary embodiment, the information forassisting the generation and operation of the virtual viewpointdepending on the virtual viewpoint content is generated and stored inadvance. In the case of generating a video image from a virtualviewpoint by using the virtual viewpoint content, the user acquires theinformation, thereby making it possible to use, for each virtualviewpoint content, information about different scenes, the position ofthe virtual viewpoint, the moving speed of the virtual viewpoint, andthe like. Consequently, it is possible to generate a video image from avirtual viewpoint, without the need for the user to search for a sceneand adjust the virtual viewpoint every time processing is performed.

The present exemplary embodiment illustrates an example of generating avideo image from a virtual viewpoint by capturing an image of a state ofa game in a stadium, as an example of details of a system and processingfor executing the processing. However, the target of the video imagefrom the virtual viewpoint is not limited to this. For example, thevideo image from the virtual viewpoint may be generated based on animage obtained by capturing an image of a concert hall, a martial artsvenue for Japanese-style wrestling (Sumo), or an image capturing studio.

System Configuration

FIG. 1 is a diagram illustrating an example of a configuration of aninformation processing system according to the present exemplaryembodiment. FIGS. 2 to 4 are flowcharts each illustrating an example ofprocessing in the information processing system. FIG. 2 is a flowchartillustrating an example of processing in the information processingsystem when the material data is generated and stored. FIG. 3 is aflowchart illustrating an example of processing in the informationprocessing system when the virtual viewpoint auxiliary information isgenerated and stored. FIG. 4 is a flowchart illustrating an example ofprocessing in the information processing system when the video imagefrom the virtual viewpoint is generated and output.

The information processing system includes, for example, image capturingunits 1, a synchronization unit 2, a material data generation unit 3, afirst storage unit 4 a, a second storage unit 4 b, a virtual viewpointauxiliary information generation unit 5, a video image generation unit6, a video image output unit 7, and an operation unit 8. The informationprocessing system may be composed of one electronic device, or may becomposed of a plurality of electronic devices.

The plurality of image capturing units 1 captures images of an imagecapturing object from a plurality of directions. The plurality of imagecapturing units 1 performs synchronous image capturing with a highaccuracy based on a synchronization signal from the synchronization unit2 (S201 in FIG. 2). FIG. 5 is a diagram illustrating an example of thearrangement of the plurality of image capturing units 1. As illustratedin FIG. 5, the plurality of image capturing units 1 can be installed soas to surround a background or an object. In this case, the plurality ofimage capturing units 1 sends captured data to the material datageneration unit 3 via a communication network. Alternatively, thecaptured data may be recorded on a storage device provided in the imagecapturing units 1, and the captured data may be input to the materialdata generation unit 3 after image capturing. Each of the imagecapturing units 1 transmits the image (captured image) obtained bycapturing an image to the material data generation unit 3. The materialdata generation unit 3 generates the material data to be used forgenerating the video image from the virtual viewpoint by using the imagecaptured from a plurality of viewpoints by the plurality of imagecapturing units 1 (S202 in FIG. 2). The first storage unit 4 a obtainsthe material data from the material data generation unit 3 and storesthe material data (S203 in FIG. 2).

The material data is data used as material for generating a virtualviewpoint video image generated based on the image captured by the imagecapturing unit 1. The material data includes, for example, one or bothof an object three-dimensional model, which is data on each voxelindicating the object three-dimensional model, and object texture forcoloring each voxel of the object three-dimensional model. Further, thematerial data can include one or both of a background three-dimensionalmodel, which is polygon data for projecting a background other than theobject, and a background texture image to be attached to the polygon ofthe background three-dimensional model. Furthermore, the material datacan include one or both of a polygon model for the object and texturefor the polygon of the object to be attached to the polygon of theobject so as to reduce the amount of data transfer. Thethree-dimensional model of the material data can be generated by, forexample, using the above-described volume intersection method. However,the three-dimensional model of the material data may be generated usinga method other than the volume intersection method, or thethree-dimensional model may be generated by any other method. Otherpieces of material data can be generated by any method.

The virtual viewpoint auxiliary information generation unit 5 generatesvirtual viewpoint auxiliary information (S301 in FIG. 3). The secondstorage unit 4 b obtains the generated virtual viewpoint auxiliaryinformation from the virtual viewpoint auxiliary information generationunit 5 and stores the virtual viewpoint auxiliary information (S302 inFIG. 3).

The virtual viewpoint auxiliary information is information for assistingthe user's operation to be performed when the video image from thevirtual viewpoint is generated. The virtual viewpoint auxiliaryinformation includes, for example, virtual viewpoint position andorientation information indicating the position and orientation of thevirtual viewpoint. The virtual viewpoint auxiliary information alsoincludes, for example, a recommended value of the moving speed of thevirtual viewpoint and a movable range when the virtual viewpoint isoperated (changed). The virtual viewpoint auxiliary information alsoincludes, for example, scene identifying information as a combination ofan identifier for identifying a scene within the virtual viewpointcontent and time information indicating the time of the scene. Thevirtual viewpoint auxiliary information also includes, for example,object identifying information.

For example, in the case of a soccer game, the virtual viewpointposition and orientation information is information indicating a virtualviewpoint capable of viewing the hack of a goalkeeper, a virtualviewpoint capable of viewing a position for a corner kick, and the like.Information indicating the position and orientation of the virtualviewpoint that can be assumed based on the game or content is stored asa preset in the second storage unit 4 b.

FIG. 6 is a diagram illustrating, in a table format, an example of thescene identifying information. As illustrated in FIG. 6, the sceneidentifying information includes an identifier (scene name) foridentifying a scene, and an image capturing time (time of scene startand time of scene end) for the scene. For example, a scene name, such as“second goal in first half”, is included in the scene identifyinginformation as a scene identifier for a highlight scene such as a goalscene. In addition, keywords, such as “goal” and “second point”, areprovided to the identifier, thereby facilitating the search for a scene,By further providing keywords, such as “player name” and “team name”, tothe scene name, the search for a scene can be further facilitated.

The object identifying information is information for facilitating theidentification of an object within a viewing angle during the operation(change) of the virtual viewpoint. Details of the object identifyinginformation will be described below.

Details of a method for generating the virtual viewpoint auxiliaryinformation will be described below.

The operation unit 8 receives an input from the user, and provides auser interface for presenting information to the user. The operationunit 8 includes a combination of, for example, a touch panel, a button,a keyboard, and a display. Before generating the video image from thevirtual viewpoint, the operation unit 8 acquires the virtual viewpointauxiliary information from the second storage unit 4 b (S401 in FIG. 4).The operation unit 8 reflects the acquired virtual viewpoint auxiliaryinformation in each part of the operation unit 8.

The operation unit 8 includes, as its functions, for example, a displayunit 9, a virtual viewpoint selection unit 10, and a time indicationunit 11. FIG. 7 is a diagram illustrating an example of a virtualviewpoint video image operation screen. The operation unit 8 displays,for example, the virtual viewpoint video image operation screen asillustrated in FIG. 7, and receives an operation from the user (S402 inFIG. 4). In other words, the operation unit 8 works as a display controlunit to display the virtual viewpoint video image on the display unit 9and virtual viewpoint selection unit 10.

On the virtual viewpoint video image operation screen illustrated inFIG. 7, the display unit 9 displays the video image from the virtualviewpoint generated from the virtual viewpoint at which the user iscurrently operating. In the case of starting the generation of a certainvirtual viewpoint content, the operation unit 8 can display, on thedisplay unit 9, the video image from a predetermined virtual viewpointof the content designated by the user using an input unit (notillustrated). In such a case, the user first operates the video imagefrom the virtual viewpoint displayed on the display unit 9.

The virtual viewpoint selection unit 10 displays, as a thumbnail image,the video image from the virtual viewpoint based on the virtualviewpoint position and orientation information included in the virtualviewpoint auxiliary information. This thumbnail image is a candidate forthe video image from the virtual viewpoint to be generated. When theuser selects the thumbnail image by using the input unit (notillustrated), the display unit 9 changes the video image from thevirtual viewpoint at which the user is currently operating, into thevideo image from the virtual viewpoint corresponding to the selectedthumbnail image. As a result, the user can perform the viewpointoperation from the same virtual viewpoint as that for the selectedthumbnail image. The time indication unit 11 designates the time for thevideo image from the virtual viewpoint to be generated.

Based on the user's operation on the input unit (not illustrated), theoperation unit 8 operates and determines the position, orientation, andviewing angle of the virtual viewpoint on the video image from thevirtual viewpoint (S403 in FIG. 4). The operation unit 8 outputs, to thevideo image generation unit 6, the virtual viewpoint information(position, orientation, and viewing angle of the virtual viewpoint)determined as described above and the time information (time of thevideo image from the virtual viewpoint) designated by the timeindication unit 11. As the input unit for operating the virtualviewpoint, a 3D mouse or the like may be used. In addition, for example,the virtual viewpoint information may be determined by an operationperformed through a graphical user interface (GUI), or by receiving anoperation by a dedicated operation unit. Further, the moving speed andthe like of the virtual viewpoint input by the input unit at this timeare changed into a speed based on a recommended moving speed included inthe virtual viewpoint auxiliary information. In this manner, the movingspeed and the like of the virtual viewpoint are controlled when the userchanges the virtual viewpoint by using the input unit.

The video image generation unit 6 acquires the material data from thefirst storage unit 4 a based on the virtual viewpoint information andtime information output from the operation unit 8, and generates a videoimage from a virtual viewpoint (S404 in FIG. 4). The video image fromthe virtual viewpoint generated by the video image generation unit 6 isoutput and displayed onto, for example, the display unit 9 of theoperation unit 8 and the video image output unit 7 (S405 in FIG. 4).

With this configuration, the use of the virtual viewpoint auxiliaryinformation stored in the second storage unit 4 b enables the operationunit 8 to easily perform setting for operating the virtual viewpointsuitable for the content (material data) in the first storage unit 4 a,and identification of the preset position and orientation of the virtualviewpoint, or a scene. Furthermore, the convenience of the user when thevideo image from the virtual viewpoint is generated and displayed can beenhanced.

Example of Method for Generating Virtual Viewpoint Auxiliary Information

The virtual viewpoint auxiliary information can be generated based on atleast one of, for example, a setting based on a user input, materialdata for generating a video image from a virtual viewpoint, and acontent type about the video image from the virtual viewpoint. As themethod for generating the virtual viewpoint auxiliary information,either one of the method of generating the virtual viewpoint auxiliaryinformation by a manual input and the method of automatically generatingthe virtual viewpoint auxiliary information by analyzing the virtualviewpoint content for which the video image from the virtual viewpointis generated may be employed. The method of generating the virtualviewpoint auxiliary information by a manual input and the method ofautomatically generating the virtual viewpoint auxiliary informationwill be described by taking virtual viewpoint position and orientationinformation, the recommended moving speed of the virtual viewpoint, andthe movable range of the virtual viewpoint as examples.

In the case of generating the virtual viewpoint position and orientationinformation by a manual input, for example, the virtual viewpointposition and orientation information can be generated by preliminarilyinputting a viewpoint suitable for a game or the like. As describedabove, in the case of a soccer game or the like, the virtual viewpointposition and orientation information on the viewpoint capable of viewingthe back of a goalkeeper, or a position for a corner kick can begenerated.

Instead of manually inputting the viewpoint suitable for each game, thevirtual viewpoint auxiliary information generation unit 5 maypreliminarily hold a viewpoint suitable for each game as a preset foreach game, and may generate the virtual viewpoint position andorientation information from the viewpoint for each game. In this case,the actual game space may be different from stadium to stadium dependingon the game. In this case, the virtual viewpoint auxiliary informationgeneration unit 5 can correct and generate the virtual viewpointposition and orientation information based on the three-dimensionalmodel of the background by referring to the three-dimensional model ofthe background of the material data. In addition, the virtual viewpointauxiliary information generation unit 5 can generate the virtualviewpoint position and orientation information based on at least one ofthe image capturing range of the image capturing unit 1 and the movablerange of the virtual viewpoint so that a corner position in the range,or the range can be viewed, In the case of generating the virtualviewpoint position and orientation information by a manual input, theline connecting the first storage unit 4 a and the virtual viewpointauxiliary information generation unit 5 to each other in FIG. 1 can beomitted.

Further, in the case of automatically generating the virtual viewpointposition and orientation information, for example, the virtual viewpointauxiliary information generation unit 5 can refer to the material datastored in the first storage unit 4 a and generate the virtual viewpointposition and orientation information based on the material data. In thiscase, for example, the virtual viewpoint auxiliary informationgeneration unit 5 can obtain the position and orientation of an objectfrom coordinate data on the three-dimensional model of the object byreferring to the three-dimensional model of the object. The virtualviewpoint auxiliary information generation unit 5 can generate thevirtual viewpoint position and orientation information based on theposition and orientation of the object so that the object of the videoimage from the virtual viewpoint can be constantly captured.

Next, the recommended moving speed and movable range of the virtualviewpoint will be described. Also, the recommended moving speed and themovable range of the virtual viewpoint may be generated by a manualinput, or may be automatically generated with reference to materialdata. For example, the virtual viewpoint auxiliary informationgeneration unit 5 can obtain a maximum moving speed or an average movingspeed of the object based on the three-dimensional model of the object,and can set the recommended moving speed of the virtual viewpoint basedon the maximum moving speed or the average moving speed. In addition,the virtual viewpoint auxiliary information generation unit 5 may obtainthe shape and size of the image-capturing region based on thethree-dimensional model of the background, and may set the speedsuitable for the shape and size of the image-capturing region as therecommended moving speed of the virtual viewpoint. The virtual viewpointmoves at the recommended moving speed.

Like the recommended moving speed of the virtual viewpoint, the shapeand size of the image-capturing region can be obtained based on thethree-dimensional model of the background, and the movable range of thevirtual viewpoint can also be obtained based on the image-capturingregion. The virtual viewpoint is changed within the movable range.

Example of Scene Identifying Information

When the image capturing units I capture a video image of a stadium gameor the like, the virtual viewpoint auxiliary information generation unit5 detects a highlight scene during the game based on the captured videoimage and records the image capturing time of the highlight scene or thelike for each scene. At this time, an identifier for identifying a sceneis recorded together with the image capturing time. The virtualviewpoint auxiliary information generation unit 5 generates, forexample, the scene identification information as illustrated in FIG. 6based on these pieces of information. In the case of automaticallygenerating the scene identifying information, the virtual viewpointauxiliary information generation unit 5 can acquire, for example, audiodata on the stadium from the material data, and can generate the sceneidentification information based on a long time of the audio. In otherwords, the virtual viewpoint auxiliary information generation unit 5 candetect an occurrence of a highlight scene or the like based on audiodata on the stadium from the material data. In addition, the virtualviewpoint auxiliary information generation unit 5 can generate the sceneidentifying information about scenes in which the user is highlyinterested in cooperation with a social networking service (SNS) or thelike.

Furthermore, the virtual viewpoint auxiliary information generation unit5 is desirably configured to record the virtual viewpoint position andorientation information, which enables the user to actually view thescene identified by the scene identifying information, together with thescene identifying information. With this configuration, when timeinformation is designated based on the scene identifying information, avideo image of the scene can be displayed based on the virtual viewpointposition and orientation information corresponding to the timeinformation. Consequently, time and labor for the user to search forobjects can be eliminated and thus the user's convenience can beenhanced.

Further, the scene identifying information is provided with thumbnailimages or the like for the scene identified by the scene identifyinginformation, thereby facilitating the identification of the scene. Thevirtual viewpoint used when the thumbnail images are generated isdesirably a virtual viewpoint identified by the virtual viewpointposition and orientation information recorded together with the sceneidentifying information described above. With this configuration, whenthe user selects a thumbnail image for the scene for which the videoimage from the virtual viewpoint is to be generated from among thethumbnail images, the operation unit 8 can perform the followingprocessing. That is, the operation unit 8 can display the thumbnailimage, which is selected by the user, in an enlarged manner. Further,the operation unit 8 designates the display as well as the time and thevirtual viewpoint position and orientation information based on thescene identifying information corresponding to the thumbnail imageselected by the user, and instructs the video image generation unit 6 togenerate the video image from the virtual viewpoint. Then, upongeneration of the video image from the virtual viewpoint by the videoimage generation unit 6, the operation unit 8 replaces the thumbnailimage with the video image from the virtual viewpoint, and displays thevideo image. Specifically, the video image from the virtual viewpointdisplayed on the display unit 9 is displayed on the virtual viewpointselection unit 10 as the thumbnail image, and the video image from thevirtual viewpoint generated by the video image generation unit 6 basedon the scene identifying information corresponding to the thumbnailimage selected by the user is displayed on the display unit 9. Thisconfiguration makes it possible to generate the video image from thevirtual viewpoint that enables continuous operation of the virtualviewpoint from the image selected as the thumbnail image by the user.

With this configuration, there is no need to generate a video image froma virtual viewpoint with a large load and capacity until the userselects a scene. Accordingly, an advantageous effect that, for example,it is possible to reduce traffic even when mobile data communication orthe like is used can be expected.

In addition, as illustrated in FIG. 8, the operation unit 8 may, forexample, use different colors to clearly indicate the time recorded onthe scene identifying information for the time indication unit 11.Further, the display of the scene name of the scene and thumbnail imageson the time indication unit 11 can facilitate the identification of thetime and the scene.

Object Identifying Information

The object identifying information includes information for identifyingeach object within the viewing angle during the operation for thevirtual viewpoint. The object identifying information is used tofacilitate the user to identify objects, for example, when the userwishes to generate a video image from a virtual viewpoint in which aspecific player is captured within the viewing angle. Specifically, thevirtual viewpoint auxiliary information generation unit 5 generates, asthe object identifying information, data that associates thethree-dimensional model of each object in material data with informationfor identifying the object (player). The operation unit 8 can display,in a superimposed manner, information, such as an object name, on theobject in the video image from the virtual viewpoint, for example, asillustrated in FIG. 9, by using the object identifying information.Accordingly, the user's convenience can be enhanced. FIG. 9 illustratesan example in which the object name is constantly displayed. However,the object name need not necessarily be displayed constantly. Forexample, a user interface for, for example, displaying the object nameonly when a mouse pointer is superimposed on the player may be used.

As described above, in the present exemplary embodiment, the virtualviewpoint auxiliary information generation unit 5 generates the virtualviewpoint auxiliary information for assisting the uses operationperformed when a video image from a virtual viewpoint is generated, andstores the generated virtual viewpoint auxiliary information in thesecond storage unit 4 b. The operation unit 8 displays, on the displayunit 9, the video image from the virtual viewpoint corresponding to thescene designated by the user, and also displays the time indication unit11 for indicating the image capturing time of the video image. Further,the operation unit 8 displays, on the virtual viewpoint selection unit10, a video image from another virtual viewpoint corresponding to thescene as a thumbnail image based on the virtual viewpoint auxiliaryinformation. When the user selects the thumbnail image displayed on thevirtual viewpoint selection unit 10, the video image generation unit 6generates the video image from the virtual viewpoint corresponding tothe thumbnail image selected by the user. Then, the operation unit 8replaces the video image from the virtual viewpoint generated by thevideo image generation unit 6 with the video image from the virtualviewpoint displayed on the display unit 9. Further, the operation unit 8displays information for identifying objects displayed on the displayunit 9. Furthermore, the operation unit 8 displays, in a distinguishedmanner, a time zone for a specific scene on the time indication unit 11,and displays information indicating the type of the specific scene atthe position corresponding to the image capturing time of the scene.This configuration facilitates the user to, for example, determine theposition and orientation of a virtual viewpoint, and identify a scene.Consequently, the user's convenience for generating the virtualviewpoint content can be enhanced.

Other Configurations

In addition, in the present exemplary embodiment, the first storage unit4 a that records material data and the second storage unit 4 b thatrecords virtual viewpoint auxiliary information are described asdifferent storage units. However, the first storage unit 4 a and thesecond storage unit 4 b need not necessarily be different storage units,but instead may be the same storage unit.

The configuration illustrated in FIG. 1 is merely an example, andvarious modified examples can be applied. For example, the operationunit 8 may be connected to the system illustrated in FIG. 1 via acommunication network such as the Internet. In this case, the operationunit 8 can be provided with auxiliary information from the secondstorage unit 4 b via the Internet, and can cause the display unit 9 todisplay the video image based on the auxiliary information. Further, inresponse to a user's operation on the video image displayed on thedisplay unit 9, the position and orientation of the virtual viewpointare determined, and the information is transmitted to the video imagegeneration unit 6 via the Internet. Also, with this configuration,technical effects based on the present exemplary embodiment can beobtained. A plurality of operation units 8 may be provided. As anotherexample, the image capturing system, the video image generation system,and the operation unit 8 may be connected via a communication networksuch as the Internet. In this configuration, the image capturing systemincludes the image capturing unit 1, the synchronization unit 2, thematerial data generation unit 3, and the first storage unit 4 a. Thevideo image generation system includes the virtual viewpoint auxiliaryinformation generation unit 5, the second storage unit 4 b, and thevideo image generation unit 6.

The exemplary embodiments described above are merely specific examplesfor carrying out the present disclosure, and the technical scope of thepresent disclosure should not be limitatively interpreted by theexemplary embodiments. That is, the present disclosure can be carriedout in various forms without departing from the technical idea or themain features of the present disclosure,

According to the present exemplary embodiment, it is possible to enhancethe user's convenience for generating a video image from a virtualviewpoint.

Other Embodiments

Embodiment(s) of the present disclosure can also be realized by acomputer of a system or apparatus that reads out and executes computerexecutable instructions (e.g., one or more programs) recorded on astorage medium (which may also be referred to more fully as a‘non-transitory computer-readable storage medium’) to perform thefunctions of one or more of the above-described embodiment(s) and/orthat includes one or more circuits (e.g., application specificintegrated circuit (ASIC)) for performing the functions of one or moreof the above-described embodiment(s), and by a method performed by thecomputer of the system or apparatus by, for example, reading out andexecuting the computer executable instructions from the storage mediumto perform the functions of one or more of the above-describedembodiment(s) and/or controlling the one or more circuits to perform thefunctions of one or more of the above-described embodiment(s). Thecomputer may comprise one or more processors e.g., central processingunit (CPU), micro processing unit (MPU)) and may include a network ofseparate computers or separate processors to read out and execute thecomputer executable instructions. The computer executable instructionsmay be provided to the computer, for example, from a network or thestorage medium. The storage medium may include, for example, one or moreof a hard disk, a random-access memory (RAM), a read only memory (ROM),a storage of distributed computing systems, an optical disk (such as acompact disc (CD), digital versatile disc (DVD), or Blu-ray Disc (BD)™),a flash memory device, a memory card, and the like.

While the present disclosure has been described with reference toexemplary embodiments, the scope of the following claims are to beaccorded the broadest interpretation so as to encompass all suchmodifications and equivalent structures and functions.

This application claims the benefit of Japanese Patent Application No.2018-007159, filed Jan. 19, 2018, which is hereby incorporated byreference herein in its entirety.

What is claimed is:
 1. An information processing apparatus that providesinformation about a virtual viewpoint image, the information processingapparatus comprising: a generation unit configured to generate sceneinformation including type information and time information, the typeinformation indicating a type of an event occurring in animage-capturing region in which an image is captured by a plurality ofcameras, the time information indicating a time when the event hasoccurred; and a provision unit configured to provide an outputdestination of material data with the scene information generated by thegeneration unit, the material data being generated from a plurality ofcaptured images obtained by the plurality of cameras capturing images ofthe image-capturing region from different directions, the material databeing used to generate the virtual viewpoint image depending on aposition and an orientation of a virtual viewpoint.
 2. The informationprocessing apparatus according to claim 1, wherein the generation unitfurther generates the material data, and the provision unit furtherprovides the material data.
 3. The information processing apparatusaccording to claim 1, wherein the generation unit further generatesrecommended viewpoint information about the position and the orientationof the virtual viewpoint for viewing the event depending on anoccurrence position of the event, and the provision unit furtherprovides the recommended viewpoint information.
 4. The informationprocessing apparatus according to claim 1, further comprising adetection unit configured to detect an occurrence of an event in theimage-capturing region by using at least one of audio data and one ormore of the plurality of captured images.
 5. The information processingapparatus according to claim 1, wherein the material data includesthree-dimensional geometric data on an object detected from the capturedimages, texture data on the object, three-dimensional geometric data ona background, and texture data on the background.
 6. The informationprocessing apparatus according to claim 1, wherein the generation unitfurther generates speed information indicating a recommended movingspeed of the virtual viewpoint, and the provision unit further providesthe speed information.
 7. The information processing apparatus accordingto claim 6, wherein the generation unit determines the recommendedmoving speed based on at least one of a moving speed of an object in theimage-capturing region, a size of the image-capturing region, and ashape of the image-capturing region.
 8. The information processingapparatus according to claim 1, wherein the generation unit furthergenerates range information indicating a movable range of the virtualviewpoint, and the provision unit further provides the rangeinformation.
 9. An information processing apparatus that generates avirtual viewpoint image, the information processing apparatuscomprising: an obtainment unit configured to obtain: scene informationincluding type information and time information, the type informationindicating a type of an event occurring in an image-capturing region inwhich an image is captured by a plurality of cameras, the timeinformation indicating a time when the event has occurred; and materialdata generated from a plurality of captured images obtained by theplurality of cameras capturing images of the image-capturing region fromdifferent directions; and a generation unit configured to generate,based on the obtained scene information and the obtained material data,a virtual viewpoint image about the event represented by the sceneinformation
 10. The information processing apparatus according to claim9, wherein the obtainment unit further obtains recommended viewpointinformation about a position and an orientation of the virtual viewpointfor viewing the event represented by the scene information, and thegeneration unit generates, based on the obtained recommended viewpointinformation, the obtained scene information, and the obtained materialdata, a virtual viewpoint image representing an appearance of the eventfrom a virtual viewpoint depending on the recommended viewpointinformation.
 11. The information processing apparatus according to claim10, further comprising a display control unit configured to cause afirst virtual viewpoint image depending on the position and theorientation of the virtual viewpoint and a second virtual viewpointimage depending on the recommended viewpoint information to be displayedon a setting screen for setting the position and the orientation of thevirtual viewpoint.
 12. The information processing apparatus according toclaim 11, wherein a space size of the second virtual viewpoint image issmaller than a space size of the first virtual viewpoint image.
 13. Theinformation processing apparatus according to claim 10, furthercomprising a display control unit configured to cause a timeline to bedisplayed on a setting screen for setting the position and theorientation of the virtual viewpoint, wherein the timeline represents aperiod of the event, and the display control unit causes a virtualviewpoint image depending on the recommended viewpoint information to bedisplayed with the timeline.
 14. An information processing method forproviding information about a virtual viewpoint image, the informationprocessing method comprising: generating scene information includingtype information and time information, the type information indicating atype of an event occurring in an image-capturing region in which animage is captured by a plurality of cameras, the time informationindicating a time when the event has occurred; and providing a device ofan output destination of material data with the scene informationgenerated in the generating, the material data being generated from aplurality of captured images obtained by the plurality of camerascapturing images of the image-capturing region from differentdirections, the material data being used to generate the virtualviewpoint image depending on a position and an orientation of a virtualviewpoint.
 15. An information processing method for generating a virtualviewpoint image, the information processing method comprising:obtaining: scene information including type information and timeinformation, the type information indicating a type of an eventoccurring in an image-capturing region in which an image is captured bya plurality of cameras, the time information indicating a time when theevent has occurred; and material data generated from a plurality ofcaptured images obtained by the plurality of cameras capturing images ofthe image-capturing region from different directions; and generating,based on the obtained scene information and the obtained material data,a virtual viewpoint image about the event represented by the sceneinformation
 16. A computer-readable storage medium storing a program forcausing a computer that provides information about a virtual viewpointimage to execute processing comprising: generating scene informationincluding type information and time information, the type informationindicating a type of an event occurring in an image-capturing region inwhich an image is captured by a plurality of cameras, the timeinformation indicating a time when the event has occurred; and providinga device of an output destination of material data with the sceneinformation in the generating, the material data being generated from aplurality of captured images obtained by the plurality of camerascapturing images of the image-capturing region from differentdirections, the material data being used to generate the virtualviewpoint image depending on a position and an orientation of a virtualviewpoint.
 17. A computer-readable storage medium storing a program forcausing a computer that generates a virtual viewpoint image to executeprocessing comprising: obtaining: scene information including typeinformation and time information, the type information indicating a typeof an event occurring in an image-capturing region in which an image iscaptured by a plurality of cameras, the time information indicating atime when the event has occurred; and material data generated from aplurality of captured images obtained by the plurality of camerascapturing images of the image-capturing region from differentdirections; and generating, based on the obtained scene information andthe obtained material data, a virtual viewpoint image about the eventrepresented by the scene information